Urine cytology is a reliable and well known tool in the diagnosis and follow-up of patients with transitional cell carcinoma even if it has high sensitivity only in high grade tumors and carcinoma in situ. In order to improve sensitivity of this test in patients with low grade tumors, new methods such as cytometry, microsatellite assays, Immunocyt®, fuorescence in-situ hybridization and Thin-Prep monolayer have been developed. These new assays will be able to increase the cytology detection rate and to predict the outcome of transitional cell carcinoma.
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